Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Plywood Web Background background image for use in web design.
Source V. Hartikainen
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
A repeating background with wood/straw like texture.
Source V. Hartikainen
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward